Clearly just a guess, but based off what they did with Maxwell...
- Summer 2016 - Mid Tier - GP104 (970/980 updates; 6GB of GDDR5X; 980 Ti performance; $400-500)
- Fall/Winter 2016 - Low Tier - GP106 (950/960 updates; 4GB of GDDR5; 970/980 performance; $200-300)
- Spring 2017 - Uber Tier - GP100 (Titan X update; 16GB of HBM2; 50% performance increase over Titan X; $1000)
- Summer 2017 - High Tier - GP100 (980 Ti update; 8GB of HBM2; 50% increase over 980 Ti; $650-700)
Moves all current performance/memory down one tier on the hierarchy, representing an upgrade across the board. Quarterly updates keeps the product line fresh. Releasing the Mid Tier and God/High Tier nearly a year apart allows Nvidia to double dip on the enthusiasts who want the latest and greatest.
That's not what they did with Maxwell. With Maxwell they launched the lowest tier first with 750/750Ti with craptastic price/performance.
$150 750Ti was slower than the $130 650Ti Boost, $120 750 got owned hard by $130 650Ti Boost. Fun, fun.
https://www.techpowerup.com/reviews/ASUS/GTX_750_OC/25.html
650Ti Boost itself was a pretty awful card for price/performance to begin with.
Skipping 970/980 for a second, 960 also came out with awful price/performance. It took them
more than 1.5 years to beat 760 by just 10-14%.
On launch date 980 beat 780Ti by just 5% at 1440P, the worst next gen x80 series increase of all time (not a surprise of course once you realize the marketing name 980 = 960Ti).
Contrast this with Kepler when 680 outperformed 580 by at least 35% and 780Ti outperform 580 by 2X. I sure hope for our sake that Pascal is more akin to Fermi -> Kepler rather than Kepler -> Maxwell.
Since now both companies are more interested in milking our wallets and splitting the generation into slow trickle of next gen parts, it's almost a complete shot in the dark to me just how much performance they are willing to give us in 2016 vs. 2017. Is it going to be 20-30% to start, 40-50%, or 15% with tons and tons of marketing slides telling us how perf/watt is the reason we should upgrade?
I'd get ready for slide decks filled with perf/watt marketing (possible inclusion of polar bears on ice to drive the point

), "Full" DX12 support (now with real hardware Asynchronous Compute?!), lots of slides about GameWorks VR, some new next gen lighting tech (say
Voxel Global Illuminati Gen 2) that will cripple all current cards but looks good on a marketing slide, maybe TXAA Gen 2 (double the blur for more cinematic feel).
thanks I will let my buddy know and most likely he will want a 980 ti
I would tend to think if your friend is willing to spend $600-650 on a flagship 980Ti card, he isn't the type to worry about resale value or price/performance. He could just use the 980Ti now for the next 6-9 months and then upgrade to the next flagship card, whenever it comes out. If we are going to measure obsolescence based on if there will be some faster cards in 2016, then 980Ti will be superseded in 2016. If our friend doesn't care to not have the fastest card in 2016, then 980Ti OC will be a fine gaming card even if something is 20-30% faster in 2016. If he doesn't want to wait until Q2 2016 or later, I'd buy the 980Ti now if that's in his budget.